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ISC Class XII Board Exam 2019 : Biology Paper 2 (Practical)

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ISC 12th
Indian School Certificate Examination (ISC), New Delhi

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BIOLOGY PAPER - 2 (PRACTICAL) (Maximum Marks: 30) (Time allowed: Three hours) (Candidates are allowed additional 15 minutes for only reading the paper. They must NOT start writing during this time.) ------------------------------------------------------------------------------------------------------------------------------Answer all questions. All working including rough work should be done on the same sheet as the rest of the answer. The intended marks for questions or parts of questions are given in brackets [ ] Note: Q4 (Spotting) is to be attempted on a separate continuation sheet. The continuation sheet is to be handed over to the Supervising Examiner after the last observation. This continuation sheet should be attached to the main answer booklet of the candidate after the examination. ------------------------------------------------------------------------------------------------------------------------------Question 1 [5] (a) Observe the given specimen D-41 carefully. Describe its floral characteristics in semi-technical terms. (Details of individual whorls are not required.) (b) With the help of a sharp razor blade, cut a longitudinal section of the specimen D-41. Place one of the cut surfaces on a moist filter paper so that all the parts are clearly visible. Show it to the Visiting Examiner. (c) Draw a neat and labelled diagram of one of the cut surfaces. (d) With the help of the hand lens provided, carefully observe the stamens. Record your observations in a tabular form as shown below: Androecium: (i) Relationship of stamens to each other (ii) Number of stamens D-41 (iii) Nature of anthers (e) Take a fresh specimen of D-41. With the help of forceps, remove the calyx and corolla. Isolate the gynoecium. Cut a transverse section of the ovary. Mount the section of the ovary in water, on a glass slide and show it to the Visiting Examiner. ------------------------------------------------------------------------------------------------------------------------------This paper consists of 3 printed pages and 1 blank page. 1219-863B Turn over Copyright reserved.

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